Method of treating slag



(Specimens.)

ST. GEORGE T'. C. BRYAN.

. METHOD OF TREATING SLAG.

Patented June 3, lQO.

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ST. GEORGE T. O. BRYAN, OF BIRMINGHAM, ALABAMA.

METHOD OF TREATING SLAG.

SPECIFICATION forming part of Letters Patent No. 429,226, dated June 3, 1890. Application filed April 3, 1889. Serial No. 305,889. (Specimens.)

To all whom t may concern:

Be it known that I, ST. GEORGE T. C. BRYAN, of Birmingham, in the county of Jefferson and State of Alabama, have invented a certain new and useful Method of Molding, Annealing, and Regulating the Cellular Structure of Articles of Manufacture, of which the following is a specification.

My improved method relates especially to molding, annealing, and regulating' the cellular structure of cellular slag in various forms; aad it consists in delivering molten slag into suitable molds and communicating to it rotary motion, such as to develop the action of centrifugal force in the mass. This may be done either by giving rotary motion to the mold or by stirring the mass of molten slag within the mold, or by both the means mentioned.

It is very useful to employ Wood, saturated (if desired) paper, or carbon composition for lining the interior of molds, so that the molten slag will be discharged upon such surfaces rather than upon metal or mineral surfaces. This prevents the contraction of the slag, closing the cells near to and on the surfaces of the molds, and prevents brittleness and hardness in the product and increases its toughness.

Various useful effects are produced by this method of molding bodies to be formed of cellular slag under the action of centrifugal force, aided by stirring With paddles, dce., which controls the number and aids in the perfect distribution of the cells. For example, the slag is prevented from chilling at the surface or adhering to the mold.` It is also kept substantially uniform in composition and in temperature and caused to cool uniformly7 by which it is rendered less brittle and tougher. It is also forced against the sides of the mold, so as to form the outline of the mold sharply upon the object to be cast or molded.

By regulating the size, number, and distribution of the cells in the slag I greatly add to its strength and value, as uniform Weight and density are secured. I also make the process of annealing much easier, more uniform, and rapid.

Any suitable means may be employed for inducing rotary motion in the mass of slag to be molded and for dividing and distributing the cells in the slag. For example, stirrers formed in part of carbonaeeous matter or wood or paper and saturated with water when desired, or made hollow for the circulation of water within them, may be used.

The accompanying drawing is an elevation, partly in section, of a simple mechanism by which my method of treating slag can be practiced; but this is only one example of such mechanism. Many varieties of mechanism might serve the purpose.

Referring to the letters upon the drawing, A designates a suitable base of a frame B, supporting a vertical shaft C, on the upper end of which is fixed a bevel gear-Wheel D, which is rotated by another bevel gear-wheel E on a shaft F, that may be turned by a crank G.

H designates a mold of clay, metal, or other' substance, having pins I projecting from its bottom into corresponding pin-holes in the upper part of the Wheel D, thus securing the mold in place to be rotated with its contents.

I do not herein enumerate all the advantages of my means for carrying out my vimproved method of simultaneously molding, annealing, and regulating the cellular structure of bodies of molten cellular slag, because a variety of instrumentalities may be employed, and a variety of useful results will follow that it is not necessary to mention in detail.

It is desirable for the purpose of this invention to have the slag distributed gradually when pouring it into the mold by pouring it in at different places.

VVh-at I claim is- The herein-described method of molding and annealing slag, and regulating the size, number, and distribution of the cells therein, which consist-s in delivering the slag in a molten or plastic state into a suitable mold, and there giving it motion to develop the action of centrifugal force in the mass while being molded.

In testimony of all which I have hereunto subscribed my name.

ST. GEORGE T. C. BRYAN.

Witnesses:

BALTE PEYTON, HARRY W. HYDE. 

